This system is off-grid home energy storage system which can output AC 230V/50Hz pure sine wave and power the TV, electric fans, refrigerators, air conditioners, washing machines, microwave ovens and other small power appliances. For this system, lithium battery and battery management system are integrated inside the cabinet which can prolong the service life of the storage battery, and its intelligent control interface is easy for operation. This system supports multiple modes of operation and is an ideal household green energy storage power product for the areas without electricity or power unstable regions.